* {
    border: 0;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --hue: 223;
    --sat: 10%;
    --bg: hsl(var(--hue), var(--sat), 90%);
    --fg: hsl(var(--hue), var(--sat), 10%);
    --hue-success: 126;
    --success1: hsl(var(--hue-success), 90%, 40%);
    --success2: hsl(var(--hue-success), 90%, 24%);
    --periwinkle: hsl(240, 90%, 70%);
    --light-blue: hsl(210, 90%, 70%);
    --orange: hsl(15, 90%, 70%);
    --magenta: hsl(300, 90%, 70%);
    --light-green: hsl(105, 40%, 70%);
    --light-teal: hsl(150, 40%, 70%);
    --purple: hsl(270, 90%, 70%);
    --trans-dur: 0.3s;
    font-size: clamp(1rem, 0.95rem + 0.25vw, 1.25rem);
}

body {
    background-color: var(--bg);
    color: var(--fg);
    display: flex;
    font: 1em/1.5 sans-serif;
    height: 100vh;
    transition: background-color var(--trans-dur), color var(--trans-dur);
}

.spinner {
    color: var(--success2);
    overflow: visible;
    margin: auto;
    width: 8em;
    height: auto;
    transition: color var(--trans-dur);
}

.spinner circle,
.spinner g,
.spinner path {
    animation-duration: 4s;
    animation-timing-function: linear;
    animation-fill-mode: forwards;
}

.spinner__check, .spinner__pop-start, .spinner__worm {
    transform-origin: 24px 24px;
}

.spinner__check {
    animation-name: check;
}

.spinner__pop-dot {
    animation-name: pop-dot;
}

.spinner__pop-dot-group {
    animation-name: pop-dot-group1;
}

.spinner__pop-dot-group + .spinner__pop-dot-group {
    animation-name: pop-dot-group2;
}

.spinner__pop-end {
    animation-name: pop-end;
}

.spinner__pop-start {
    animation-name: pop-start;
}

.spinner__worm {
    animation-name: worm;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: hsl(var(--hue), var(--sat), 10%);
        --fg: hsl(var(--hue), var(--sat), 90%);
    }

    .spinner {
        color: var(--success1);
    }
}

/* Animations */
@keyframes check {
    from, 64% {
        stroke-dashoffset: -36.7;
        transform: scale(1);
    }
    75%, 77% {
        animation-timing-function: cubic-bezier(0.65, 0, 0.35, 1);
        stroke-dashoffset: 13.7;
        transform: scale(1);
    }
    79% {
        animation-timing-function: cubic-bezier(0.65, 0, 0.35, 1);
        stroke-dashoffset: 13.7;
        transform: scale(0.4);
    }
    87% {
        animation-timing-function: cubic-bezier(0.32, 0, 0.67, 0);
        stroke-dashoffset: 13.7;
        transform: scale(1.4);
    }
    93%, to {
        stroke-dashoffset: 13.7;
        transform: scale(1);
    }
}

@keyframes pop-dot {
    from, 80% {
        animation-timing-function: cubic-bezier(0.33, 1, 0.68, 1);
        transform: translate(0, 6px);
    }
    90%, to {
        transform: translate(0, 0);
    }
}

@keyframes pop-dot-group1 {
    from, 82.5%, 90%, to {
        opacity: 0;
    }
    85%, 87.5% {
        opacity: 1;
    }
}

@keyframes pop-dot-group2 {
    from, 82.5%, to {
        opacity: 0;
    }
    85%, 90% {
        opacity: 1;
    }
}

@keyframes pop-end {
    from {
        animation-timing-function: steps(1, end);
        opacity: 0;
        r: 18px;
        stroke-width: 4px;
    }
    82.5% {
        animation-timing-function: linear;
        opacity: 1;
        r: 18px;
        stroke-width: 4px;
    }
    84%, to {
        opacity: 0;
        r: 19px;
        stroke-width: 3px;
    }
}

@keyframes pop-start {
    from {
        animation-timing-function: steps(1, end);
        opacity: 0;
        transform: scale(0.35);
    }
    76% {
        animation-timing-function: cubic-bezier(0.65, 0, 0.35, 1);
        opacity: 1;
        transform: scale(0.35);
    }
    82.5% {
        animation-timing-function: steps(1, start);
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(1);
    }
}

@keyframes worm {
    from {
        stroke-dashoffset: -51.84;
        transform: rotate(-119deg);
    }
    60% {
        stroke-dashoffset: -51.84;
        transform: rotate(961deg);
    }
    64% {
        animation-timing-function: cubic-bezier(0.61, 1, 0.88, 1);
        stroke-dashoffset: -51.84;
        transform: rotate(1033deg);
    }
    72.5%, to {
        stroke-dashoffset: -138.23;
        transform: rotate(1033deg);
    }
}